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Finding the Fourth Proportional to 85,383.72, 128,047.90 and 28,442.44

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Solution

The fourth proportional to 85,383.72, 128,047.90 and 28,442.44 is: 42,654.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,383.72 : 128,047.90 = 28,442.44 : x
  2. Step 2: Convert to fraction form
    85,383.72/128,047.90 = 28,442.44/x
  3. Step 3: Cross multiply
    85,383.72x = 128,047.90 × 28,442.44
  4. Step 4: Simplify right side
    85,383.72x = 3,641,994,712.88
  5. Step 5: Solve for x
    x = 3,641,994,712.88/85,383.72
  6. Step 6: Final answer
    x = 42,654.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.